Hydraulic pump



.Dec. 16, 1941. w. F. TEBBETTS, JR

HYDRAULIC PUMP Filed Nov. 18, 1940 INV ENT OR.

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L Patented Dee. .16, 1941 lUNITED STATES PATENT OFFICE k, lHynnnumcPUMPr William F. 'lebbettsh Jr., Los Angeles, Calif. Application November 1s, 1940, serial No. 366,072 (Cl. a-46) 11 Claims.

The present invention relates generally to pumps, more particularly deep well pumps as used in the ow of oil from oil wells, and has for its primary object the provision of an hydraulically operated rodless pumping apparatus which willbe simple, inexpensive as such apparatus goes, and very durable especially in sandy oil.

A further object is the provision of an hydraulically operated pump of the above' character which may be readily installed within well tubing in connection with old working barrels and economically installed and operated withoutv the dangers and forced delays commonly incident to the invention is shown in the accompanying` drawing, forming a part of this speciiication, and wherein,

Figure l is a side view, partly in elevation and partly in section, showing my improved pump installed for use, the showing being partly diagrammatic, with the traveling barrel in an intermediate position.

Figure 2 is a vertical longitudinal sectional view through a portion thereof, the traveling barrel being in upper position at the end of its eective stroke.

Figure 3 is a similar View, the traveling barrel being in the lower or return position.

Figure 4 is a detail cross section on a somewhat enlarged scale, the section being taken substantially on line 4-4 of Figure 2.

Figure 5 is a detail top plan view of the lower bushing of the casing, and

Figure 6 is a detail side view of said bushing.

Referring now to these gures, there is shown, more especially in Figure 1, a cylindrical pump casingV Ill in upper and lower cylindrical sections joined at their contiguous ends by a threaded joint at I I, the upper section opening-at its upper end into a reduced outflow or discharge tube I2 by which the casing is run into well tubing I3.

The lower section of the cylindrical pump oaslng I0 is closed by a lower bushing I4 xed therein and snugly, though slidably, surrounding the stem or tube |5 of the plunger. The upper end of tube I5 is xed to the lower tapering end I6 is a continuation ofthe passage of tube or stern I5 and whose upper end carries the cage I9 of the standing valve 20 adapted to seat in the upper end of its passage I8.

The lower end of the plunger stem or tube I5, below the lower end of casing I0, has xed thereon, a hold-down whose body 2| carries surrounding hold-,down cups 22 and a cup nut 23 to thus allow the pump to be inserted in the top of an old working barrel 24 coupled to the lower end of the well tubing |3. The hold-down body 2| has the usual upper ange 25 which engages the upper end of the old working barrel 24 and the cups 22 t snugly within the barrel so as to retain the pump inthe proper operating position and pack off against downow of clean-oil into the barrel 24. 'I'he passage 26 of the hold-down is a lower continuation of the passage of the plunger stem or tube I5.

The plunger head I'I snugly, slidably interfts the traveling barrel tube 21 having at its upper end an upper bushing 28 on which are the traveling valve 29 and its cage 30. The lower end of traveling barrel tube 2l is closed by a lower bushing 3|` slidably embracing the plunger stem or tube I5 and provided with -a tapering lower end 32 shaped to I'lt a corresponding upper inner counterbore 33 of the' lower casing bushing I4.

Intermediate its ends, the traveling barrel tube il has therearound a sleeve 34 held by upper and lower rings 35 and 36 which may be threaded on the tube, it being particularly noted that the diameter of sleeve 34 is such that it snugly, though slidably, interi-its casing l0, there being a plain metal to metal contact between its outer surface and the inner surface of casing I0, for a purpose which will presently appear.

Below its sleeve 34, the traveling barrel tube 21 has wall openings 3'I so spaced from its lower bushing 3| that they will be moved upwardly beyond the tapering lower end I6 of the plunger head Il during the latter portion of the upward elective stroke of the traveling barrel, before its lower bushing 3| reaches the lower extremity of said tapering head end tothus close the space in Athe traveling barrel below the plunger head with entrapped uid to create a fluid buffer or check as the traveling barrel reaches the end of its upward eiiectivel stroke. On its downstroke the tapering lower end 32 of its lower bushing 3| similarly forms a buffer or check for the traveling barrel in the counterbore 33 before mentioned.

Near its lower end, and immediately above its of the hollow plunger head l1 whose passage I8 55 lower bushing I4, the casing I0 is shown as provided with wall openings 34, placing the space therein below the traveling barrel in communication with the interior ofthe well tubing I3 for the reception of clean oil with which said tubing is filled in operation.

When the pump is set within the well tubing I3, its outow or discharge tube: I2 is supported, as by means of slips 39 in the tubing head 40 which is packed oi! by packing 4I above a laterally extending pressure conduit 42 extending to the tubing from a valve casing 43. In casing 43 is a three-way valve 44 having an angular channel 45 and rotatable to one position placing conduit 42 in communication with a fluid pressure supply pipe 45, and to another position placing said conduit 42 in communication with a uid pressure relief pipe 41 which opens downwardly above a sump 48 containing clean oil.

'I'he pressure supply pipe 46 leads from a pump at 49 through an accumulator 5&0, and the pump takes clean oil from the sump 48 through a suction pipe and may be operated by an electric or other motor 52 which may also be connected by a belt 53 to drive a crank 54` connected as by means of a link 55 to the controlling arm 55 of an upward direction from its lowermost position ;z

shown in Figure 3 to its uppermost position shown in Figure 2. In Figure 1 the traveling barrel is shown at an intermediate point in its effective stroke, during which stroke it is lifting oil from the well past the standing valve 20 and into the traveling barrel, while at the same time it is raising the level of oil in the casing I0 and outilow tube I2 resulting from previous operations.

During the above described working or effective stroke of the traveling barrel 21, a portion of the clean oil, supplied within the lower portion of the casing Ill and the lower portion of the traveling barrel 21, is forced upwardly in a thin film between the sleeve 34 and casing I0 and also between said sleeve and the plunger head I1, due to the plain metal to metal contact of these parts, so as to dilute the oil from the well and in this way preserve the working parts of the pump against excessive wear and prevent settling of sand in and around the pump valves in case the well uid is of sandy quality.

As the traveling barrel 21 approaches the upper limit of its working stroke shown in Figure 2, the passage of the wall openings 31 thereof upwardly along the tapering lower end I6 of the plunger head I1 gradually cushions its further upward travel owing to the fluid check previously mentioned so that it slowly reaches its upward limit of movement shown in Figure 2 where the fluid pressure control valve 44 is shifted to place the uid pressure supply pipe 42 in communication with pressure relief pipe 41.

Thus pressure is relieved on the fluid standing in the well tubing I3, and the two fluid columns being then balanced, the travelling barrel 21 drops to its lowermost position shown in Figure 3, or if necessary sumcient pressure may be retained on the column of fluid in the pump casing Il and outflow tube I2 to force the travelling barrel downwardly upon relief of tubing pressure,

by placing a iiow controlling bean or valve in the outflow tube I2, the use of both being well known in the art. A

Obviously since the pressure actuating fluid is clean oil and provision is made for dilution thereby of the oil produced from the well, the pump as thus described is especially applicable to wells of low formation pressure and production of oil more or less heavy with sand.

Having thus fully described the present invention, what is claimed is,

1. In an hydraulic pump in combination with I well tubing, a pump casing for disposition within said well tubing and open at its lower portion for communication with said tubing, an outilow tube for said casing, a plunger rising within said casing and having means for packing oil' therearound againstthe well tubing at a point below the casing, a standing valve carried by said plunger, means whereby fluid pressure in the well tubing may be raised and lowered, a traveling barrel around the plunger within the casing sub- `lect to rise and fall in accordance with the rise and fall of tubing uid pressureagainst a portion thereof in the casing, and a traveling valve carried by said traveling barrel.

2. In an hydraulic pump in combination with well tubing, a pump casing for disposition within said well tubing and open at its lower portion for communicationwith said tubing, an outflow tube for said casing, a plunger rising within said casing and having means for packing off therearound against the well tubing at a point below the casing,y a standing valve carried vby said plunger, means whereby fluid pressure in the well tubing may be raised and lowered, a traveling barrel around the plunger within the casing subject to rise and :fall in accordance with the rise and fall of tubing fluid pressure against a portion thereof in the casing, and a traveling valve carried by said traveling barrel, said traveling barrel having a metal to metal sliding contact around the plunger and within the casing for the rise of fluid pressure of the tubing past the traveling barrel.

3. In. an hydraulic pump in combination with well tubing, a pump casing for disposition within said Well tubing and open at its lower portion for communication with said tubing, an outilow tube for said casing, a plunger rising within said casing and having means for packing off therearound against the well tubing at a point below the casing. a standing valve Lcarried by said plunger, means whereby fluid pressure in the well tubing may be raised and lowered, a traveling barrel around the plunger within the casing subject to rise and fall in accordance with the rise and fall of tubing fluid pressure against a portion thereof in the casing, and a traveling valve carried by said traveling barrel, the plunger including a head within the traveling barrel having a tapering lower end, ,and said traveling barrel having a lower bushing closely surrounding the plunger below its head, and having fluid pressure receiving openings through its wall adjacent to said bushing.

4. In an hydraulic pump the combination with well tubing, a pump casing for disposition in such tubing and open at its lower portion for communication with the tubing, an outflow tube for said casing, a tubular plunger upstanding within the casing, means for packing oif against the tubing around the plunger below the casing to form within the tubing a space for the reception of clean oil under pressure above the packing o means, a standing valve carried by said plunger, a traveling barrel slidable on the plunger and slidably intertting the casing, said traveling barrel being subject to raising and lowering in accordance with the rise and fall of the clean uid pressure within the tubing against a portion of the barrel, and a traveling valve carried by said barrel above the plunger.

5. In a hydraulic pump of the type set forth, a tubular plunger, a cylindrical casing through the lower end of which the plunger upstands, having means for receiving fluid pressure within its lower portion around the said plunger, a standing valve carried by the plunger, a traveling barrel slidably telescoping the plunger and slidably interftting the casing, having its lower end exposed to uid pressure within the lower portion of the casing, and a traveling valve carried by the said barrel above the plunger.

6. In an hydraulic pump of the type set forth, a tubular plunger, a cylindrical casing through the lower end of which the plunger upstands, having means for receiving fluid pressure within its lower portion around the said plunger, a standing valve carried by the plunger, a traveling barrel slidably telescoping the plunger within the casing and having its lower end exposed to fluid pressure within the lower portion of the casing, and a traveling valve carried by the said barrel above the plunger, said barrel having a metal to metal contact with the casing providing for upow of iiuid under pressure between the barrel and casing.

7. In an hydraulic pump of the character described, a cylindrical casing having means for receiving uid pressure within the lower portion thereof, a tubular plunger upstanding through the lower end of said casing and having an enlarged head at its upper end, a standing valve carried by said plunger, a traveling barrel snugly telescoping the head of the plunger and ex- I ternally in sliding contact with the wall of the casing, a bushing fixed in the lower end of the barrel around the plunger below its head and within the lower portion of the casing, and a traveling valve carried by the said barrel above the plunger head, the barrel having openings through the wall thereof adjacent to said bushing.

8. In an hydraulic pump of the character described, a cylindrical casing having means for receiving iiuid pressure within the lower portion thereof, 'a tubular plunger upstanding through the lower end of said casing and having an enlarged head at its upper end, a standing valve carried by said plunger, a traveling barrel snugly telescoping the head of the plunger and externally in sliding contact with the wall of the casing. a bushing fixed in the lower end of the barrel around the plunger below its head and within the lower portion of the casing, and a traveling valve carried by the said barrel above the plunger head, the barrel having openings through the wall thereof adjacent to said bushing, said plunger head having a tapering lower end along which the barrel openings are movable as the barrel n-ears the limit of its upward movement.

9, In an hydraulic pump of the character described, a cylindrical casing having means for receiving fluid pressure within the lower portion thereof, a tubular plunger upstanding through the lower end of said casing and having an enlarged head at its upper end, a standing valve carried by said plunger, a traveling barrel snugly telescoping the head of the plunger and externally in sliding contact with the wall of the casing, a bushing fixed in the lower end of the barrel around the plunger below its head and within the lower portion of the casing, and a traveling valve carried by the said barrel above the plunger head, the barrel having openings through the wall thereof adjacent to said bushing, the said barrel bushing having a depending 'tapering portion, and the lower -end of the casing having a tapering counterbore for receiving the tapering portion of said bushing in the lowermost position of the barrel.

10. An hydraulic pump including a cylindrical casing having means for receiving uid pressure within its lower portion, a tubular plunger upstanding through the lower end of the casing and having an upper enlarged head therein, a standing valve carried thereby, a hold-down on the lower end of said plunger below the casing, a traveling barrel slidably telescoping the plunger head, and slidably in contact with the inner surface of the casing for the upflow of fluid pressure past the barrel, a traveling valve carried by the barrel above the plunger, and a bushing at the lower end of the barrel around the plunger belew its head, said barrel having wall openings above said bushing.

11. In a hydraulic rodless pump of the type set forth, a tubular plunger, a cylindrical casing through the lower end of which the plunger upstands, a standing valve carried by the plunger, a traveling barrel slidably telescoping the plunger and slidably interiitting the casing, and a traveling valve carried by said barrel above the plunger, and said traveling barrel being exposed to fluid pressure thereabove in the casing for causing downward movement of the barrel, and said casing having means for receiving fluid pressure within the lower portion thereof below the barrel for causing upward movement of the latter. I

W'ILLIAM F, TEBBETTS, JR. 

